I am a first time smoker. I am smoking a Boston Butt (Pork shoulder), no bone, tonight so we can have pulled pork sandwiches tomorrow for Thanksgiving. My plan was to smoke it for up to 6 hours or until it reached 140 degrees, then to wrap it in tin foil and place in my oven at 225 degrees until done at 210 degrees. My problem is that I reached 140 degrees in my smoker MUCH faster than I had anticipated. I was eagle eyeing the smoker to ensure the temp didn't go over 225 degrees. There were a couple of times it did get up to maybe 250 but not for very long, maybe 5 minutes or so until I could regulate it back down to 225. There were also a couple of times when the internal temp dropped to about 200 or so, but nothing that seemed too drastic that I didn't get it back up to temp in time. Have I done something completely wrong here? Any advise is GREATLY appreciated. My set up is a CharGriller with the side fire box. I lined the inside of the cooking chamber with foil. I was using apple wood soaked in water for about 3 hours prior to smoking.